With at least 5% accuracy, I would assume.
Barrie, W7ALW
----- Original Message -----
From: "D. Scott MacKenzie" <kb0fhp@comcast.net>
To: <towertalk@contesting.com>
Sent: Wednesday, May 04, 2005 6:24 PM
Subject: Re: [TowerTalk] Bird loading and elements
> There are also aerodynamic loads from wings flapping......
>
> I think the risk at shooting at them is not the release of the load
> (unless
> you were standing under them), but hitting the elements... then it would
> certainly be a dynamics problem.
>
> Since the questions was posed as "how many birds does it take to cause an
> element to fail...." then a first order statics answer would be
> appropriate....
>
> -----Original Message-----
> From: Martin, AA6E [mailto:martin.ewing@gmail.com]
> Sent: Wednesday, May 04, 2005 8:21 PM
> To: kb0fhp@comcast.net; towertalk@contesting.com
> Subject: Re: [TowerTalk] Bird loading and elements
>
>
> It's a dynamics problem, not only statics. Those birds are conducting
> flight operations after all. If you shoot at them, they'll all take
> off at once, and then you'll be sorry. That's if they jump up to take
> off. :-)
>
> -Martin
>
> On 5/4/05, D. Scott MacKenzie <kb0fhp@comcast.net> wrote:
>> Actually, determining failure from static bird loading is relatively easy
> to
>> calculate. Any introductory statics (or strength of materials) book will
>> explain the basic techniques. It is really only a couple of equations to
>> calculate the deflection, and the number of birds required to cause an
>> element to fail. The only things needed are the number of birds, the
> weight
>> of the birds (easy to estimate from any bird book), the size of the
> element
>> (diameter, length and wall thickness), and the alloy (it can probably be
>> assumed to be 6063-T6).....
>>
>> The actual calculation is left as an exercise for the student......
>>
>
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
> Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with
> any questions and ask for Sherman, W2FLA.
>
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>
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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